As we register two usb buses for each xHC, and systems with several
hosts are more and more common it is getting hard to follow the
flow of debug messages without knowing which bus they belong to
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210820123503.2605901-7-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Add more debugging messages to follow what happends to a URB internally
in special cases like URB cancel, halted endpoints and endpoint reset.

Helps tracking issues like URB never given back by host.
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210820123503.2605901-6-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit 5d5323a6.

That commit effectively disabled Intel host initiated U1/U2 lpm for devices
with periodic endpoints.

Before that commit we disabled host initiated U1/U2 lpm if the exit latency
was larger than any periodic endpoint service interval, this is according
to xhci spec xhci 1.1 specification section 4.23.5.2

After that commit we incorrectly checked that service interval was smaller
than U1/U2 inactivity timeout. This is not relevant, and can't happen for
Intel hosts as previously set U1/U2 timeout = 105% * service interval.

Patch claimed it solved cases where devices can't be enumerated because of
bandwidth issues. This might be true but it's a side effect of accidentally
turning off lpm.

exit latency calculations have been revised since then
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210820123503.2605901-5-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Only TDs with status TD_CLEARING_CACHE will be given back after
cache is cleared with a set TR deq command.

xhci_invalidate_cached_td() failed to set the TD_CLEARING_CACHE status
for some cancelled TDs as it assumed an endpoint only needs to clear the
TD it stopped on.

This isn't always true. For example with streams enabled an endpoint may
have several stream rings, each stopping on a different TDs.

Note that if an endpoint has several stream rings, the current code
will still only clear the cache of the stream pointed to by the last
cancelled TD in the cancel list.

This patch only focus on making sure all canceled TDs are given back,
avoiding hung task after device removal.
Another fix to solve clearing the caches of all stream rings with
cancelled TDs is needed, but not as urgent.

This issue was simultanously discovered and debugged by
by Tao Wang, with a slightly different fix proposal.

Fixes: 674f8438 ("xhci: split handling halted endpoints into two steps")
Cc: <stable@vger.kernel.org> #5.12
Reported-by: NTao Wang <wat@codeaurora.org>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210820123503.2605901-4-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Removes static char buffer usage in the following decode functions:
	xhci_decode_ctrl_ctx()
	xhci_decode_slot_context()
	xhci_decode_usbsts()
	xhci_decode_doorbell()
	xhci_decode_ep_context()

Caller must provide a buffer to use.
In tracing use __get_str() as recommended to pass buffer.

Minor changes are needed in other xhci code as these functions are also
used elsewhere

Cc: <stable@vger.kernel.org>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210820123503.2605901-3-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Removes static char buffer usage in the following decode functions:
	xhci_decode_trb()
	xhci_decode_ptortsc()

Caller must provide a buffer to use.
In tracing use __get_str() as recommended to pass buffer.

Minor chanes are needed in xhci debugfs code as these functions are also
used there. Changes include moving XHCI_MSG_MAX definititon from
xhci-trace.h to xhci.h

Cc: <stable@vger.kernel.org>
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210820123503.2605901-2-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

f_hid provides the OUT Endpoint as only way for receiving reports
from the host. SETUP/SET_REPORT method is not supported, and this causes
a number of compatibility problems with various host drivers, especially
in the case of keyboard emulation using f_hid.

  - Some hosts do not support the OUT Endpoint and ignore it,
    so it becomes impossible for the gadget to receive a report
    from the host. In the case of a keyboard, the gadget loses
    the ability to receive the status of the LEDs.

  - Some BIOSes/UEFIs can't work with HID devices with the OUT Endpoint
    at all. This may be due to their bugs or incomplete implementation
    of the HID standard.
    For example, absolutely all Apple UEFIs can't handle the OUT Endpoint
    if it goes after IN Endpoint in the descriptor and require the reverse
    order (OUT, IN) which is a violation of the standard.
    Other hosts either do not initialize gadgets with a descriptor
    containing the OUT Endpoint completely (like some HP and DELL BIOSes
    and embedded firmwares like on KVM switches), or initialize them,
    but will not poll the IN Endpoint.

This patch adds configfs option no_out_endpoint=1 to disable
the OUT Endpoint and allows f_hid to receive reports from the host
via SETUP/SET_REPORT.

Previously, there was such a feature in f_hid, but it was replaced
by the OUT Endpoint [1] in the commit 99c51500 ("usb: gadget: hidg:
register OUT INT endpoint for SET_REPORT"). So this patch actually
returns the removed functionality while making it optional.
For backward compatibility reasons, the OUT Endpoint mode remains
the default behaviour.

  - The OUT Endpoint mode provides the report queue and reduces
    USB overhead (eliminating SETUP routine) on transmitting a report
    from the host.

  - If the SETUP/SET_REPORT mode is used, there is no report queue,
    so the userspace will only read last report. For classic HID devices
    like keyboards this is not a problem, since it's intended to transmit
    the status of the LEDs and only the last report is important.
    This mode provides better compatibility with strange and buggy
    host drivers.

Both modes passed USBCV tests. Checking with the USB protocol analyzer
also confirmed that everything is working as it should and the new mode
ensures operability in all of the described cases.

Link: https://www.spinics.net/lists/linux-usb/msg65494.html [1]
Reviewed-by: NMaciej Żenczykowski <zenczykowski@gmail.com>
Acked-by: NFelipe Balbi <balbi@kernel.org>
Signed-off-by: NMaxim Devaev <mdevaev@gmail.com>
Link: https://lore.kernel.org/r/20210821134004.363217-1-mdevaev@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge tag 'thunderbolt-for-v5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-next

Mika writes:

thunderbolt: Changes for v5.15 merge window

This includes following Thunderbolt/USB4 changes for the v5.15 merge
window:

  * Include authorized value in the KOBJ_CHANGE event of a device router
  * A couple of improvements to get the driver working also with the AMD
    USB4 host controller.

All these have been in linux-next with no reported issues.

* tag 'thunderbolt-for-v5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  thunderbolt: Fix port linking by checking all adapters
  thunderbolt: Do not read control adapter config space
  thunderbolt: Handle ring interrupt by reading interrupt status register
  thunderbolt: Add vendor specific NHI quirk for auto-clearing interrupt status
  thunderbolt: Add authorized value to the KOBJ_CHANGE uevent

We need the USB fix in here as well.
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Pull powerpc fixes from Michael Ellerman:

 - Fix random crashes on some 32-bit CPUs by adding isync() after
   locking/unlocking KUEP

 - Fix intermittent crashes when loading modules with strict module RWX

 - Fix a section mismatch introduce by a previous fix.

Thanks to Christophe Leroy, Fabiano Rosas, Laurent Vivier, Murilo
Opsfelder Araújo, Nathan Chancellor, and Stan Johnson.

h# -----BEGIN PGP SIGNATURE-----

* tag 'powerpc-5.14-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm: Fix set_memory_*() against concurrent accesses
  powerpc/32s: Fix random crashes by adding isync() after locking/unlocking KUEP
  powerpc/xive: Do not mark xive_request_ipi() as __init

Pull clk driver fixes from Stephen Boyd:

 - Make the regulator state match the GDSC power domain state at boot on
   Qualcomm SoCs so that the regulator isn't turned off inadvertently.

 - Fix earlycon on i.MX6Q SoCs

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: qcom: gdsc: Ensure regulator init state matches GDSC state
  clk: imx6q: fix uart earlycon unwork

Pull char/misc driver fixes from Greg KH:
 "Here are some small driver fixes for 5.14-rc7.

  They consist of:

   - revert for an interconnect patch that was found to have problems

   - ipack tpci200 driver fixes for reported problems

   - slimbus messaging and ngd fixes for reported problems

  All are small and have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  ipack: tpci200: fix memory leak in the tpci200_register
  ipack: tpci200: fix many double free issues in tpci200_pci_probe
  slimbus: ngd: reset dma setup during runtime pm
  slimbus: ngd: set correct device for pm
  slimbus: messaging: check for valid transaction id
  slimbus: messaging: start transaction ids from 1 instead of zero
  Revert "interconnect: qcom: icc-rpmh: Add BCMs to commit list in pre_aggregate"

Pull USB fix from Greg KH:
 "Here is a single USB typec tcpm fix for a reported problem for
  5.14-rc7. It showed up in 5.13 and resolves an issue that Hans found.
  It has been in linux-next this week with no reported problems"

* tag 'usb-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: typec: tcpm: Fix VDMs sometimes not being forwarded to alt-mode drivers

Pull RISC-V fixes from Palmer Dabbelt:

 - fix the sifive-l2-cache device tree bindings for json-schema
   compatibility. This does not change the intended behavior of the
   binding.

 - avoid improperly freeing necessary resources during early boot.

* tag 'riscv-for-linus-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: Fix a number of free'd resources in init_resources()
  dt-bindings: sifive-l2-cache: Fix 'select' matching

Pull s390 fix from Vasily Gorbik:

 - fix use after free of zpci_dev in pci code

* tag 's390-5.14-5' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pci: fix use after free of zpci_dev

Pull mandatory file locking deprecation warning from Jeff Layton:
 "As discussed on the list, this patch just adds a new warning for folks
  who still have mandatory locking enabled and actually mount with '-o
  mand'. I'd like to get this in for v5.14 so we can push this out into
  stable kernels and hopefully reach folks who have mounts with -o mand.

  For now, I'm operating under the assumption that we'll fully remove
  this support in v5.15, but we can move that out if any legitimate
  users of this facility speak up between now and then"

* tag 'locks-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
  fs: warn about impending deprecation of mandatory locks

Pull block fixes from Jens Axboe:
 "Three fixes from Ming Lei that should go into 5.14:

   - Fix for a kernel panic when iterating over tags for some cases
     where a flush request is present, a regression in this cycle.

   - Request timeout fix

   - Fix flush request checking"

* tag 'block-5.14-2021-08-20' of git://git.kernel.dk/linux-block:
  blk-mq: fix is_flush_rq
  blk-mq: fix kernel panic during iterating over flush request
  blk-mq: don't grab rq's refcount in blk_mq_check_expired()

Pull io_uring fixes from Jens Axboe:
 "A few small fixes that should go into this release:

   - Fix never re-assigning an initial error value for io_uring_enter()
     for SQPOLL, if asked to do nothing

   - Fix xa_alloc_cycle() return value checking, for cases where we have
     wrapped around

   - Fix for a ctx pin issue introduced in this cycle (Pavel)"

* tag 'io_uring-5.14-2021-08-20' of git://git.kernel.dk/linux-block:
  io_uring: fix xa_alloc_cycle() error return value check
  io_uring: pin ctx on fallback execution
  io_uring: only assign io_uring_enter() SQPOLL error in actual error case

We've had CONFIG_MANDATORY_FILE_LOCKING since 2015 and a lot of distros
have disabled it. Warn the stragglers that still use "-o mand" that
we'll be dropping support for that mount option.

Cc: stable@vger.kernel.org
Signed-off-by: NJeff Layton <jlayton@kernel.org>

We currently check for ret != 0 to indicate error, but '1' is a valid
return and just indicates that the allocation succeeded with a wrap.
Correct the check to be for < 0, like it was before the xarray
conversion.

Cc: stable@vger.kernel.org
Fixes: 61cf9370 ("io_uring: Convert personality_idr to XArray")
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Pull ACPI fixes from Rafael Wysocki:
 "These fix two mistakes in new code.

  Specifics:

   - Prevent confusing messages from being printed if the PRMT table is
     not present or there are no PRM modules (Aubrey Li).

   - Fix the handling of suspend-to-idle entry and exit in the case when
     the Microsoft UUID is used with the Low-Power S0 Idle _DSM
     interface (Mario Limonciello)"

* tag 'acpi-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: PM: s2idle: Invert Microsoft UUID entry and exit
  ACPI: PRM: Deal with table not present or no module found

Pull power management fixes from Rafael Wysocki:
 "These fix some issues in the ARM cpufreq drivers and in the operating
  performance points (OPP) framework.

  Specifics:

   - Fix useless WARN() in the OPP core and prevent a noisy warning
     from being printed by OPP _put functions (Dmitry Osipenko).

   - Fix error path when allocation failed in the arm_scmi cpufreq
     driver (Lukasz Luba).

   - Blacklist Qualcomm sc8180x and Qualcomm sm8150 in
     cpufreq-dt-platdev (Bjorn Andersson, Thara Gopinath).

   - Forbid cpufreq for 1.2 GHz variant in the armada-37xx cpufreq
     driver (Marek Behún)"

* tag 'pm-5.14-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  opp: Drop empty-table checks from _put functions
  cpufreq: armada-37xx: forbid cpufreq for 1.2 GHz variant
  cpufreq: blocklist Qualcomm sm8150 in cpufreq-dt-platdev
  cpufreq: arm_scmi: Fix error path when allocation failed
  opp: remove WARN when no valid OPPs remain
  cpufreq: blacklist Qualcomm sc8180x in cpufreq-dt-platdev

Merge misc fixes from Andrew Morton:
 "10 patches.

  Subsystems affected by this patch series: MAINTAINERS and mm (shmem,
  pagealloc, tracing, memcg, memory-failure, vmscan, kfence, and
  hugetlb)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  hugetlb: don't pass page cache pages to restore_reserve_on_error
  kfence: fix is_kfence_address() for addresses below KFENCE_POOL_SIZE
  mm: vmscan: fix missing psi annotation for node_reclaim()
  mm/hwpoison: retry with shake_page() for unhandlable pages
  mm: memcontrol: fix occasional OOMs due to proportional memory.low reclaim
  MAINTAINERS: update ClangBuiltLinux IRC chat
  mmflags.h: add missing __GFP_ZEROTAGS and __GFP_SKIP_KASAN_POISON names
  mm/page_alloc: don't corrupt pcppage_migratetype
  Revert "mm: swap: check if swap backing device is congested or not"
  Revert "mm/shmem: fix shmem_swapin() race with swapoff"

Pull drm fixes from Dave Airlie:
 "Regularly scheduled fixes. The ttm one solves a problem of GPU drivers
  failing to load if debugfs is off in Kconfig, otherwise the i915 and
  mediatek, and amdgpu fixes all fairly normal.

  Nouveau has a couple of display fixes, but it has a fix for a
  longstanding race condition in it's memory manager code, and the fix
  mostly removes some code that wasn't working properly and has no
  userspace users. This fix makes the diffstat kinda larger but in a
  good (negative line-count) way.

  core:
   - fix drm_wait_vblank uapi copying bug

  ttm:
   - fix debugfs init when debugfs is off

  amdgpu:
   - vega10 SMU workload fix
   - DCN VM fix
   - DCN 3.01 watermark fix

  amdkfd:
   - SVM fix

  nouveau:
   - ampere display fixes
   - remove MM misfeature to fix a longstanding race condition

  i915:
   - tweaked display workaround for all PCHs
   - eDP MSO pipe sanity for ADL-P fix
   - remove unused symbol export

  mediatek:
   - AAL output size setting
   - Delete component in remove function"

* tag 'drm-fixes-2021-08-20-3' of git://anongit.freedesktop.org/drm/drm:
  drm/amd/display: Use DCN30 watermark calc for DCN301
  drm/i915/dp: remove superfluous EXPORT_SYMBOL()
  drm/i915/edp: fix eDP MSO pipe sanity checks for ADL-P
  drm/i915: Tweaked Wa_14010685332 for all PCHs
  drm/nouveau: rip out nvkm_client.super
  drm/nouveau: block a bunch of classes from userspace
  drm/nouveau/fifo/nv50-: rip out dma channels
  drm/nouveau/kms/nv50: workaround EFI GOP window channel format differences
  drm/nouveau/disp: power down unused DP links during init
  drm/nouveau: recognise GA107
  drm: Copy drm_wait_vblank to user before returning
  drm/amd/display: Ensure DCN save after VM setup
  drm/amdkfd: fix random KFDSVMRangeTest.SetGetAttributesTest test failure
  drm/amd/pm: change the workload type for some cards
  Revert "drm/amd/pm: fix workload mismatch on vega10"
  drm: ttm: Don't bail from ttm_global_init if debugfs_create_dir fails
  drm/mediatek: Add component_del in OVL and COLOR remove function
  drm/mediatek: Add AAL output size configuration

Pull PCI fixes from Bjorn Helgaas:

 - Add Rahul Tanwar as Intel LGM Gateway PCIe maintainer (Rahul Tanwar)

 - Add Jim Quinlan et al as Broadcom STB PCIe maintainers (Jim Quinlan)

 - Increase D3hot-to-D0 delay for AMD Renoir/Cezanne XHCI (Marcin
   Bachry)

 - Correct iomem_get_mapping() usage for legacy_mem sysfs (Krzysztof
   Wilczyński)

* tag 'pci-v5.14-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI/sysfs: Use correct variable for the legacy_mem sysfs object
  PCI: Increase D3 delay for AMD Renoir/Cezanne XHCI
  MAINTAINERS: Add Jim Quinlan et al as Broadcom STB PCIe maintainers
  MAINTAINERS: Add Rahul Tanwar as Intel LGM Gateway PCIe maintainer

Pull MMC host fixes from Ulf Hansson:

 - dw_mmc: Fix hang on data CRC error

 - mmci: Fix voltage switch procedure for the stm32 variant

 - sdhci-iproc: Fix some clock issues for BCM2711

 - sdhci-msm: Fixup software timeout value

* tag 'mmc-v5.14-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: sdhci-iproc: Set SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN on BCM2711
  mmc: sdhci-iproc: Cap min clock frequency on BCM2711
  mmc: sdhci-msm: Update the software timeout value for sdhc
  mmc: mmci: stm32: Check when the voltage switch procedure should be done
  mmc: dw_mmc: Fix hang on data CRC error

Pull more sound fixes from Takashi Iwai:
 "This is a quick follow up for 5.14: a fix for a very recently
  introduced regression on ASoC Intel Atom driver, and another trivial
  HD-audio quirk for HP laptops"

* tag 'sound-5.14-rc7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ASoC: intel: atom: Fix breakage for PCM buffer address setup
  ALSA: hda/realtek: Limit mic boost on HP ProBook 445 G8

Pull arm64 fixes from Will Deacon:

 - Fix cleaning of vDSO directories

 - Ensure CNTHCTL_EL2 is fully initialised when booting at EL2

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: initialize all of CNTHCTL_EL2
  arm64: clean vdso & vdso32 files

* acpi-pm:
  ACPI: PM: s2idle: Invert Microsoft UUID entry and exit

Pull iommu fixes from Joerg Roedel:

 - Fix for a potential NULL-ptr dereference in IOMMU core code

 - Two resource leak fixes

 - Cache flush fix in the Intel VT-d driver

* tag 'iommu-fixes-v5.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Fix incomplete cache flush in intel_pasid_tear_down_entry()
  iommu/vt-d: Fix PASID reference leak
  iommu: Check if group is NULL before remove device
  iommu/dma: Fix leak in non-contiguous API

* pm-opp:
  opp: Drop empty-table checks from _put functions
  opp: remove WARN when no valid OPPs remain

syzbot hit kernel BUG at fs/hugetlbfs/inode.c:532 as described in [1].
This BUG triggers if the HPageRestoreReserve flag is set on a page in
the page cache.  It should never be set, as the routine
huge_add_to_page_cache explicitly clears the flag after adding a page to
the cache.

The only code other than huge page allocation which sets the flag is
restore_reserve_on_error.  It will potentially set the flag in rare out
of memory conditions.  syzbot was injecting errors to cause memory
allocation errors which exercised this specific path.

The code in restore_reserve_on_error is doing the right thing.  However,
there are instances where pages in the page cache were being passed to
restore_reserve_on_error.  This is incorrect, as once a page goes into
the cache reservation information will not be modified for the page
until it is removed from the cache.  Error paths do not remove pages
from the cache, so even in the case of error, the page will remain in
the cache and no reservation adjustment is needed.

Modify routines that potentially call restore_reserve_on_error with a
page cache page to no longer do so.

Note on fixes tag: Prior to commit 846be085 ("mm/hugetlb: expand
restore_reserve_on_error functionality") the routine would not process
page cache pages because the HPageRestoreReserve flag is not set on such
pages.  Therefore, this issue could not be trigggered.  The code added
by commit 846be085 ("mm/hugetlb: expand restore_reserve_on_error
functionality") is needed and correct.  It exposed incorrect calls to
restore_reserve_on_error which is the root cause addressed by this
commit.

[1] https://lore.kernel.org/linux-mm/00000000000050776d05c9b7c7f0@google.com/

Link: https://lkml.kernel.org/r/20210818213304.37038-1-mike.kravetz@oracle.com
Fixes: 846be085 ("mm/hugetlb: expand restore_reserve_on_error functionality")
Signed-off-by: NMike Kravetz <mike.kravetz@oracle.com>
Reported-by: <syzbot+67654e51e54455f1c585@syzkaller.appspotmail.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Originally the addr != NULL check was meant to take care of the case
where __kfence_pool == NULL (KFENCE is disabled).  However, this does
not work for addresses where addr > 0 && addr < KFENCE_POOL_SIZE.

This can be the case on NULL-deref where addr > 0 && addr < PAGE_SIZE or
any other faulting access with addr < KFENCE_POOL_SIZE.  While the
kernel would likely crash, the stack traces and report might be
confusing due to double faults upon KFENCE's attempt to unprotect such
an address.

Fix it by just checking that __kfence_pool != NULL instead.

Link: https://lkml.kernel.org/r/20210818130300.2482437-1-elver@google.com
Fixes: 0ce20dd8 ("mm: add Kernel Electric-Fence infrastructure")
Signed-off-by: NMarco Elver <elver@google.com>
Reported-by: NKuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Acked-by: NAlexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>    [5.12+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

In a debugging session the other day, Rik noticed that node_reclaim()
was missing memstall annotations.  This means we'll miss pressure and
lost productivity resulting from reclaim on an overloaded local NUMA
node when vm.zone_reclaim_mode is enabled.

There haven't been any reports, but that's likely because
vm.zone_reclaim_mode hasn't been a commonly used feature recently, and
the intersection between such setups and psi users is probably nil.

But secondary memory such as CXL-connected DIMMS, persistent memory etc,
and the page demotion patches that handle them
(https://lore.kernel.org/lkml/20210401183216.443C4443@viggo.jf.intel.com/)
could soon make this a more common codepath again.

Link: https://lkml.kernel.org/r/20210818152457.35846-1-hannes@cmpxchg.orgSigned-off-by: NJohannes Weiner <hannes@cmpxchg.org>
Reported-by: NRik van Riel <riel@surriel.com>
Reviewed-by: NShakeel Butt <shakeelb@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

HWPoisonHandlable() sometimes returns false for typical user pages due
to races with average memory events like transfers over LRU lists.  This
causes failures in hwpoison handling.

There's retry code for such a case but does not work because the retry
loop reaches the retry limit too quickly before the page settles down to
handlable state.  Let get_any_page() call shake_page() to fix it.

[naoya.horiguchi@nec.com: get_any_page(): return -EIO when retry limit reached]
  Link: https://lkml.kernel.org/r/20210819001958.2365157-1-naoya.horiguchi@linux.dev

Link: https://lkml.kernel.org/r/20210817053703.2267588-1-naoya.horiguchi@linux.dev
Fixes: 25182f05 ("mm,hwpoison: fix race with hugetlb page allocation")
Signed-off-by: NNaoya Horiguchi <naoya.horiguchi@nec.com>
Reported-by: NTony Luck <tony.luck@intel.com>
Reviewed-by: NYang Shi <shy828301@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>		[5.13+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We've noticed occasional OOM killing when memory.low settings are in
effect for cgroups.  This is unexpected and undesirable as memory.low is
supposed to express non-OOMing memory priorities between cgroups.

The reason for this is proportional memory.low reclaim.  When cgroups
are below their memory.low threshold, reclaim passes them over in the
first round, and then retries if it couldn't find pages anywhere else.
But when cgroups are slightly above their memory.low setting, page scan
force is scaled down and diminished in proportion to the overage, to the
point where it can cause reclaim to fail as well - only in that case we
currently don't retry, and instead trigger OOM.

To fix this, hook proportional reclaim into the same retry logic we have
in place for when cgroups are skipped entirely.  This way if reclaim
fails and some cgroups were scanned with diminished pressure, we'll try
another full-force cycle before giving up and OOMing.

[akpm@linux-foundation.org: coding-style fixes]

Link: https://lkml.kernel.org/r/20210817180506.220056-1-hannes@cmpxchg.org
Fixes: 9783aa99 ("mm, memcg: proportional memory.{low,min} reclaim")
Signed-off-by: NJohannes Weiner <hannes@cmpxchg.org>
Reported-by: NLeon Yang <lnyng@fb.com>
Reviewed-by: NRik van Riel <riel@surriel.com>
Reviewed-by: NShakeel Butt <shakeelb@google.com>
Acked-by: NRoman Gushchin <guro@fb.com>
Acked-by: NChris Down <chris@chrisdown.name>
Acked-by: NMichal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>		[5.4+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Everyone has moved from Freenode to Libera so updated the channel entry
for MAINTAINERS.

Link: https://github.com/ClangBuiltLinux/linux/issues/1402
Link: https://lkml.kernel.org/r/20210818022339.3863058-1-nathan@kernel.orgSigned-off-by: NNathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

printk("%pGg") outputs these two flags as hexadecimal number, rather
than as a string, e.g:

	GFP_KERNEL|0x1800000

Fix this by adding missing names of __GFP_ZEROTAGS and
__GFP_SKIP_KASAN_POISON flags to __def_gfpflag_names.

Link: https://lkml.kernel.org/r/20210816133502.590-1-rppt@kernel.org
Fixes: 013bb59d ("arm64: mte: handle tags zeroing at page allocation time")
Fixes: c275c5c6 ("kasan: disable freed user page poisoning with HW tags")
Signed-off-by: NMike Rapoport <rppt@linux.ibm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When placing pages on a pcp list, migratetype values over
MIGRATE_PCPTYPES get added to the MIGRATE_MOVABLE pcp list.

However, the actual migratetype is preserved in the page and should
not be changed to MIGRATE_MOVABLE or the page may end up on the wrong
free_list.

The impact is that HIGHATOMIC or CMA pages getting bulk freed from the
PCP lists could potentially end up on the wrong buddy list.  There are
various consequences but minimally NR_FREE_CMA_PAGES accounting could
get screwed up.

[mgorman@techsingularity.net: changelog update]

Link: https://lkml.kernel.org/r/20210811182917.2607994-1-opendmb@gmail.com
Fixes: df1acc85 ("mm/page_alloc: avoid conflating IRQs disabled with zone->lock")
Signed-off-by: NDoug Berger <opendmb@gmail.com>
Acked-by: NVlastimil Babka <vbabka@suse.cz>
Acked-by: NMel Gorman <mgorman@techsingularity.net>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>